(19)

(11)

EP 0 894 174 A1

(12)

(43) Date of publication: 03.02.1999 Bulletin 1999/05 (21) Application number: 97918446.0 (22) Date of filing: 04.04.1997

(51) International Patent Classification (IPC):  E04H 12/ 22( . ) (86) International application number: PCT/SE1997/000567 (87) International publication number: WO 1997/039212 (23.10.1997 Gazette 1997/45)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE (30) Priority: 18.04.1996 SE 19960001472 (71) Applicant: Lunds Energi AB 221 00 Lund (SE)	(72) Inventors: SVENSSON, Sven, Bertil, Erling S-224 76 Lund (SE) JOHANSSON, Bo, Ingemar S-213 74 Malmö (SE) (74) Representative: Bjerre, Nils B.J., et al  AWAPATENT AB, P.O. Box 5117 200 71 Malmö 200 71 Malmö (SE)